When I ordered my Proxmark3, I ordered some blanks. I ordered 125 and 13.5 cards not knowing what I was ordering. The 125 cards said T5577, didn’t really see what the 13.5 cards were.
Using TagInfo… BTW, it doesn’t work on my iPhone, but works on my Galaxy S24 … I was able to read both blanks, but here’s the odd thing. It reads the T5577 as “unknown Mifare Classic, possibly cloned”, just like the 13.5 blanks. Is this normal, and if so, why?
Getting back to my original question, which blank RFID/NFC cards should I purchase, to keep on hand?
the T5577 is a low frequency chip and phones can’t read it. Unless you have a card with two chips in it.
Those are chinise Mifare Classic clones. They might have the backdoors that would allow you to change the UID or they might not.
I have a bunch of dual frequency cards that contain a Gen 1 Magic Mifare and a T5577, but buying random cards from china comes with the risk that you might get a different chip than the one advertised.
The cards that Pilgrimsmaster recommend are what they say on the tin, so I’d start there.